Eliminate thousands of warnings with gcc 3.2 build

When building with gcc 3.2 I get thousands of warnings such as

include/linux/gfp.h: In function `allocflags_to_migratetype':
include/linux/gfp.h:105: warning: null format string

due to passing a NULL format string to warn_slowpath() in

#define __WARN()		warn_slowpath(__FILE__, __LINE__, NULL)

Split this case out into a separate call.  This also shrinks the kernel
slightly:

          text    data     bss     dec     hex filename
       4802274  707668  712704 6222646  5ef336 vmlinux
          text    data     bss     dec     hex filename
       4799027  703572  712704 6215303  5ed687 vmlinux

due to removeing one argument from the commonly-called __WARN().

[akpm@linux-foundation.org: reduce scope of `empty']
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h
index e727fe0d145107f48ae5699364f390e3d3298bd5..4b6755984d241261941334dcf5f8c8431a5c6e54 100644 (file)
--- a/include/asm-generic/bug.h
+++ b/include/asm-generic/bug.h
@@ -58,12 +58,13 @@ struct bug_entry {
  */
 #ifndef __WARN
 #ifndef __ASSEMBLY__
-extern void warn_slowpath(const char *file, const int line,
+extern void warn_slowpath_fmt(const char *file, const int line,
                const char *fmt, ...) __attribute__((format(printf, 3, 4)));
+extern void warn_slowpath_null(const char *file, const int line);
 #define WANT_WARN_ON_SLOWPATH
 #endif
-#define __WARN()               warn_slowpath(__FILE__, __LINE__, NULL)
-#define __WARN_printf(arg...)  warn_slowpath(__FILE__, __LINE__, arg)
+#define __WARN()               warn_slowpath_null(__FILE__, __LINE__)
+#define __WARN_printf(arg...)  warn_slowpath_fmt(__FILE__, __LINE__, arg)
 #else
 #define __WARN_printf(arg...)  do { printk(arg); __WARN(); } while (0)
 #endif

diff --git a/kernel/panic.c b/kernel/panic.c
index 3dcaa1661357809bb1605779f625d9c9a92594f4..874ecf1307aee212e1208289ea300865dca18385 100644 (file)
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -340,7 +340,7 @@ void oops_exit(void)
 }
 
 #ifdef WANT_WARN_ON_SLOWPATH
-void warn_slowpath(const char *file, int line, const char *fmt, ...)
+void warn_slowpath_fmt(const char *file, int line, const char *fmt, ...)
 {
        va_list args;
        char function[KSYM_SYMBOL_LEN];
@@ -356,7 +356,7 @@ void warn_slowpath(const char *file, int line, const char *fmt, ...)
        if (board)
                printk(KERN_WARNING "Hardware name: %s\n", board);
 
-       if (fmt) {
+       if (*fmt) {
                va_start(args, fmt);
                vprintk(fmt, args);
                va_end(args);
@@ -367,7 +367,14 @@ void warn_slowpath(const char *file, int line, const char *fmt, ...)
        print_oops_end_marker();
        add_taint(TAINT_WARN);
 }
-EXPORT_SYMBOL(warn_slowpath);
+EXPORT_SYMBOL(warn_slowpath_fmt);
+
+void warn_slowpath_null(const char *file, int line)
+{
+       static const char *empty = "";
+       warn_slowpath_fmt(file, line, empty);
+}
+EXPORT_SYMBOL(warn_slowpath_null);
 #endif
 
 #ifdef CONFIG_CC_STACKPROTECTOR